JPS58100079A - Power unit for hydraulic elevator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a power unit for a hydraulic elevator, and particularly to a power unit having a structure suitable for easily adapting to changes in piping from a hydraulic muffler to a hydraulic jack.

A hydraulic elevator uses a pump to send pressure oil through an oil pipe to a hydraulic jack, and the hydraulic jack raises a car directly connected to the jack.When lowering a car, the car's load and The pressure oil in the hydraulic jack is drained by the weight of the hydraulic jack, and deceleration and stopping are performed by controlling the throttle valve inside the control valve.

However, when the elevator goes up and down, it generates noise that is typical of hydraulic elevators. In other words, when rising, there is a driving sound of the pump pumping out pressure oil, and pressure pulsations occur on the discharge side of the pump due to the pressure oil being sent out, the pressure of which changes periodically as the pump rotates. Vibration and noise are generated in the car as it propagates through the hydraulic pipes and reaches the car.

Also, when descending, when the throttle valve inside the control valve is operated during deceleration, the flow rate of oil passing through the throttle valve increases,
A high-frequency sound is generated, which reaches the car, causing noise in the car.

Therefore, conventional power units are configured as shown in FIGS. 1 and 2. l is the power unit body,
2 is a tank, and oil in the tank 2 is sucked through a suction pipe 3 by a pump 6 driven by an electric motor 4 via a belt 5, and is discharged from the pump 6. 7 is a control valve installed on the discharge side of the pump processor, and a pipe 8 is installed on the outlet side of the control valve 7.
A hydraulic muffler 9 is provided through the pump 6, and the hydraulic muffler 9 absorbs the drive sound of the pump 6, the pulsation of pressure oil from the pump 6, and the popping sound generated by the control valve 7, causing vibration and noise in the car. I try not to. A stop valve 10 is provided on the outlet side of the hydraulic muffler 9 to prevent the car from falling back into the oil sump 2 in the hydraulic jack (not shown) during maintenance and inspection. 11 is the base.

By the way, since the power unit main body 1 is usually installed in the machine room of an elevator, it is necessary to reduce the size of the power unit, which limits the size of the hydraulic muffler 9. Unfortunately, the length of the piping 8 from the pump 6 and control valve 7, which are the sources of the sound, cannot be set to the optimum length to maximize the noise reduction effect of the hydraulic muffler 9. As a result, the noise reduction effect of the hydraulic muffler 9 becomes insufficient, and to compensate for this, a second hydraulic muffler 9' is usually installed outside the power unit main body 1.

However, providing two hydraulic mufflers like this poses a cost problem, and as shown in the figure, the hydraulic muffler 9
′ is placed horizontally? Pace problems and changes in the piping up to the hydraulic jack cannot be easily dealt with, and new problems generally arise in that the piping becomes longer.

The present invention has been made in view of the above, and its purpose is to provide a power unit for a hydraulic elevator that can reduce the installation area of a hydraulic muffler and can easily accommodate changes in piping from the hydraulic muffler to the hydraulic jack. It's about doing.

A feature of the present invention is that a hydraulic muffler is installed vertically outside the power unit main body, and a connection port for piping to a hydraulic jack is provided at the upper end of the hydraulic muffler.

The present invention will be explained in detail below using the embodiments shown in FIGS. 3 to 6.

Components that are the same as those in FIG. 1 are designated by the same reference numerals, and their explanation will be omitted here. A hydraulic muffler 9 is installed on the outside of the pump unit main body l, and as shown in FIGS. 7, unit internal piping 8A, OT flexible pipe 8B,
Connection was made using external piping 8C. The flexible tube 8B and the external piping 8C pass through the outside of the power unit main body 1, and the EIT flexible tube 8B is supported by a support stand 12a fixed to the base 11, as shown in FIG. Like the flexible pipe 8B, the external pipe 8C was supported by a support stand 12b fixed to the base 11, and the external pipe 8C was connected to the bottom inlet of the hydraulic muffler 9. Piping 8A and 8C
The reason why the flexible tube 8B is connected between them is to prevent mechanical vibrations from being transmitted to the external wiring @SC when starting the electric motor 4 through the piping. is used. A stop valve 10 is directly connected to a connection port 14 provided at the upper end of the hydraulic muffler 9, and a hydraulic jack of a hydraulic elevator (not shown) is connected to the stop valve 10 via a joint 15 and piping 16. .

According to the embodiment of the present invention described above, (a) Since the hydraulic muffler 9 is installed vertically on the outside of the power unit main body 1, the power unit main body 1 can be made smaller and lighter, and the installation area of the hydraulic muffler 9 can be reduced. Can be made smaller.

(b) Since the connection port 14 for piping to the hydraulic jack is provided at the upper end of the hydraulic muffler 9, it is possible to easily change the piping to the hydraulic jack by changing the mounting position and mounting direction of the joint 15. .

(c) Since the hydraulic muffler 9 can be made of a size that has been sufficiently considered in terms of capacity to provide a good noise reduction effect, there is no need to install second and third hydraulic mufflers as in the conventional case.

There are effects such as

As described above, according to the present invention, the installation area of the hydraulic muffler can be reduced and the piping from the hydraulic muffler to the hydraulic jack can be easily changed.

[Brief explanation of drawings]

Figure 1 is a plan view of a conventional power unit, and Figure 2 is a top view of a conventional power unit.
3 is a plan view showing one embodiment of the power unit of the present invention, FIG. 4 is a front view of FIG. 3, FIG. 5 is a side view of FIG. 3, and FIG. It is a sectional view taken along the line AA in the figure. Hydraulic muffler, 14... connection port. No. Z121 Figure 3 Continued from page 1 0 Inventor Akira Nakahodomo 1070 Ichige, Katsuta City Hitachi Ltd. Mito Factory 444-

Claims (1)

[Claims] 1. A power unit main body comprising a tank, a pump driven by an electric motor that sucks in oil in the tank and discharges it, and a control valve connected to the discharge side of the pump, and a power unit provided on the outlet side of the control valve. A power unit comprising a hydraulic muffler, wherein the hydraulic muffler is vertically installed outside the power unit main body, and a connection port for piping to a hydraulic jack is provided at the upper end of the hydraulic muffler. − power unit.